Collar anchor



FIG. 1 is a top, front, left perspective view of a collar anchor showing the new design.

FIG. 2 is a bottom, rear, left perspective view thereof.

FIG. 3 is a left side view thereof.

FIG. 4 is a right side view thereof.

FIG. 5 is a front view thereof.

FIG. 6 is a rear view thereof.

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof.

The dash-dot-dash broken lines shown in the drawings depict the boundaries of the claim and form no part of the claimed design. The dash-dash broken lines depict portions of the collar anchor that form no part of the claimed design. 

CLAIM The ornamental design for a collar anchor, as shown and described. 